/*******************************************************************************
 * Copyright 2013 Ray Tsang
 * 
 * Licensed under the Apache License, Version 2.0 (the "License");
 * you may not use this file except in compliance with the License.
 * You may obtain a copy of the License at
 * 
 *   http://www.apache.org/licenses/LICENSE-2.0
 * 
 * Unless required by applicable law or agreed to in writing, software
 * distributed under the License is distributed on an "AS IS" BASIS,
 * WITHOUT WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied.
 * See the License for the specific language governing permissions and
 * limitations under the License.
 ******************************************************************************/
package org.jdeferred.impl;

import java.util.concurrent.Callable;
import java.util.concurrent.ExecutionException;
import java.util.concurrent.Future;

public class FutureCallable<V> implements Callable<V> {
	private final Future<V> future;
	
	public FutureCallable(Future<V> future) {
		this.future = future;
	}

	@Override
	public V call() throws Exception {
		try {
			return future.get();
		} catch (InterruptedException e) {
			throw e;
		} catch (ExecutionException e) {
			if (e.getCause() instanceof Exception)
				throw (Exception) e.getCause();
			else throw e;
		}
	}

}
